Last Update: 9/5/17

Chapter 296-835 WAC

DIPPING AND COATING OPERATIONS (DIP TANKS)

WAC Sections

Definitions.
Scope.
General requirements.
CONSTRUCTION
Construct safe dip tanks.
VENTILATION
Provide proper ventilation for the vapor area.
Take additional precautions if you recirculate ventilation system exhaust air into the workplace.
Take additional precautions when using an exhaust hood.
INSPECTION
Periodically inspect your dip tanks and associated equipment and correct any deficiencies.
FIRST AID
Make sure employees working near dip tanks know appropriate first-aid procedures.
CLEANING
Prepare dip tanks before cleaning.
CYANIDE
Safeguard cyanide tanks.
WELDING
Protect employees during welding, burning, or other work using open flames.
LIQUIDS HARMFUL TO SKIN
Protect employees that use liquids that may burn, irritate, or otherwise harm the skin.
Additional requirements for dip tanks using flammable liquids or liquids with flashpoints greater than 199.4°F (93°C).
CONSTRUCTION
Include additional safeguards when constructing dip tanks.
Provide overflow pipes.
Provide bottom drains.
FIRE PROTECTION
Provide fire protection in the vapor area.
Provide additional fire protection for large dip tanks.
ELECTRICAL WIRING AND EQUIPMENT AND SOURCES OF IGNITION
Prevent static electricity sparks or arcs when adding liquids to a dip tank.
Control ignition sources.
Provide safe electrical wiring and equipment where the liquid can drip or splash.
HOUSEKEEPING
Keep the area around dip tanks clear of combustible material and properly dispose of waste.
HEATING LIQUID
Make sure heating the liquid in your dip tanks does not cause a fire.
HEAT DRYING
Make sure a heating system used for drying objects does not cause a fire.
CONVEYORS
Make sure conveyor systems are safe.
Additional requirements for dip tanks used for specific processes.
HARDENING OR TEMPERING
Meet specific requirements if you use a hardening or tempering tank.
ELECTROSTATIC EQUIPMENT
Meet specific requirements if you use electrostatic equipment.
FLOW COATING
Meet specific requirements if you use a flow coating process.
ROLL COATING
Take additional precautions if your roll coating operation uses a liquid that has a flashpoint below 140°F (60°C).
VAPOR DEGREASING
Provide additional safeguards for vapor degreasing tanks.
SPRAY CLEANING OR DEGREASING
Control liquid spray over an open surface cleaning or degreasing tank.
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